Bmap Instant
1. Introduction: What is BMAP? In the world of digital imaging and geographic information systems (GIS), efficiency is paramount. While most people are familiar with standard image formats like JPEG, PNG, or BMP, specialized fields require more tailored solutions. BMAP (short for Binary Map ) is a raster graphics format that stores image data in a raw, uncompressed binary form, where each pixel is typically represented by a single bit (0 or 1). Unlike a photograph that stores millions of colors, a BMAP stores a binary state: on/off, true/false, land/water, or occupied/empty.
Tools like ImageMagick can convert any image to a 1-bit BMP, which can then be stripped to raw binary: While most people are familiar with standard image
A Roomba vacuum cleaner’s internal map of a room is a real-time BMAP. 4.2. GIS & Land Cover Classification In remote sensing, land cover is often classified into binary themes: water vs. land, forest vs. non-forest, urban vs. rural. BMAP provides a storage-efficient way to archive such masks for large geographical areas. A 10,000 x 10,000 pixel BMAP occupies only 12.5 MB. 4.3. Embedded Systems & Microcontrollers Devices with limited RAM (e.g., Arduino, STM32) cannot decode JPEG or PNG. BMAP allows direct memory mapping: byte* pixelData = loadFile("map.bmap"); then read bit k via bitwise operations. No parsing, no decompression. 4.4. Game Development (Retro & Tile-based) Early 8-bit games stored level maps as binary arrays. Modern indie game engines sometimes use BMAP for collision masks: a separate binary layer that defines where the player can walk. 5. Creating and Using a BMAP File 5.1. Manual Creation (Python Example) def create_bmap(width, height, data_bits): # data_bits: list of 0/1 values, length = width * height bmap_bytes = bytearray() for i in range(0, len(data_bits), 8): byte = 0 for j in range(8): if i + j < len(data_bits) and data_bits[i + j]: byte |= (1 << (7 - j)) # MSB first bmap_bytes.append(byte) # Optionally write width, height as 4-byte ints at start with open('map.bmap', 'wb') as f: f.write(width.to_bytes(4, 'little')) f.write(height.to_bytes(4, 'little')) f.write(bmap_bytes) 5.2. Reading a BMAP (C snippet for embedded) #include <stdint.h> int get_pixel(const uint8_t* bmap_data, int x, int y, int width) int byte_index = (y * width + x) / 8; int bit_offset = 7 - ((y * width + x) % 8); // MSB first return (bmap_data[byte_index] >> bit_offset) & 1; Tools like ImageMagick can convert any image to
BMAP sacrifices color and compression for maximum simplicity and speed. 4. Primary Applications of BMAP 4.1. Robotics & Occupancy Grids The most common use of BMAP is in occupancy grid mapping for autonomous robots. Each cell in the grid is binary: 0 = occupied (wall, obstacle) or 1 = free (drivable). SLAM (Simultaneous Localization and Mapping) algorithms often export maps as BMAP files because they can be loaded rapidly into embedded systems with limited CPU power. int get_pixel(const uint8_t* bmap_data
